问题 解答题

用递等式计算(能巧算的要巧算)

218+59+282+141

201×99

5000-(39+22)×62

83×183-83×83

288+36×17÷51

6930÷[235-160÷(31+9)].

答案

(1)218+59+282+141,

=(218+282)+(59+141),

=500+200,

=700;

(2)201×99,

=(200+1)×99,

=200×99+1×99,

=19800+99,

=19899;

(3)5000-(39+22)×62,

=5000-61×62,

=5000-3782,

=1218;

(4)83×183-83×83,

=(183-83)×83,

=100×83,

=8300;

(5)288+36×17÷51,

=288+612÷51,

=288+12,

=300;

(6)6930÷[235-160÷(31+9)],

=6930÷[235-160÷40],

=6930÷[235-4],

=6930÷231,

=30.

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